treat "failed" as "not"

[stephbuon]

Having gone carefully over the entire Bill, he had failed to discern any substantial benefit to the landlord under its provisions—there would be no such benefit—on the contrary, under the Bill the landlord was treated as a kind of interloper, and everybody had a right to interfere with his property but himself.

treat failed as not

[stephbuon]

@alexanderr , can you please extract "failed to" not just "failed"

Example triples from sentence above:

he failed discern benefit he failed discern under provisions

Should be:

he failed to discern benefit he failed to discern under provisions

Thank you!